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authorMichael S. Tsirkin <mst@redhat.com>2016-01-21 15:44:10 +0300
committerMichael S. Tsirkin <mst@redhat.com>2016-01-26 11:18:30 +0300
commit481eaec37e91e2b33f17275901172f50ce2c71e8 (patch)
treecd0df9f9f652f12820d5f615a0016da3f98839d4 /tools/virtio/ringtest/run-on-all.sh
parentfb9b050ce9695cf2769a850d94aa2ab39c8c3cd5 (diff)
downloadlinux-481eaec37e91e2b33f17275901172f50ce2c71e8.tar.xz
tools/virtio: add ringtest utilities
This adds micro-benchmarks useful for tuning virtio ring layouts. Three layouts are currently implemented: - virtio 0.9 compatible one - an experimental extension bypassing the ring index, polling ring itself instead - an experimental extension bypassing avail and used ring completely Typical use: sh run-on-all.sh perf stat -r 10 --log-fd 1 -- ./ring It doesn't depend on the kernel directly, but it's handy to have as much virtio stuff as possible in one tree. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'tools/virtio/ringtest/run-on-all.sh')
-rwxr-xr-xtools/virtio/ringtest/run-on-all.sh24
1 files changed, 24 insertions, 0 deletions
diff --git a/tools/virtio/ringtest/run-on-all.sh b/tools/virtio/ringtest/run-on-all.sh
new file mode 100755
index 000000000000..52b0f71ffa8d
--- /dev/null
+++ b/tools/virtio/ringtest/run-on-all.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+#use last CPU for host. Why not the first?
+#many devices tend to use cpu0 by default so
+#it tends to be busier
+HOST_AFFINITY=$(cd /dev/cpu; ls|grep -v '[a-z]'|sort -n|tail -1)
+
+#run command on all cpus
+for cpu in $(cd /dev/cpu; ls|grep -v '[a-z]'|sort -n);
+do
+ #Don't run guest and host on same CPU
+ #It actually works ok if using signalling
+ if
+ (echo "$@" | grep -e "--sleep" > /dev/null) || \
+ test $HOST_AFFINITY '!=' $cpu
+ then
+ echo "GUEST AFFINITY $cpu"
+ "$@" --host-affinity $HOST_AFFINITY --guest-affinity $cpu
+ fi
+done
+echo "NO GUEST AFFINITY"
+"$@" --host-affinity $HOST_AFFINITY
+echo "NO AFFINITY"
+"$@"